2 * Copyright (c) 1988 The Regents of the University of California.
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the University of California, Berkeley. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 * @(#)popen.c 5.7 (Berkeley) 2/14/89
21 * $FreeBSD: src/usr.sbin/cron/cron/popen.c,v 1.7.2.3 2000/12/11 01:03:31 obrien Exp $
22 * $DragonFly: src/usr.sbin/cron/cron/popen.c,v 1.5 2004/12/18 22:48:03 swildner Exp $
25 /* this came out of the ftpd sources; it's been modified to avoid the
26 * globbing stuff since we don't need it. also execvp instead of execv.
30 #include <sys/signal.h>
36 #if defined(LOGIN_CAP)
37 # include <login_cap.h>
42 #define WANT_GLOBBING 0
45 * Special version of popen which avoids call to shell. This insures noone
46 * may create a pipe to a hidden program as a side effect of a list or dir
53 cron_popen(char *program
, char *type
, entry
*e
)
60 char *argv
[MAX_ARGS
+ 1];
61 # if defined(LOGIN_CAP)
69 extern char **glob(), **copyblk();
72 if ((*type
!= 'r' && *type
!= 'w') || type
[1])
76 if ((fds
= getdtablesize()) <= 0)
78 if (!(pids
= (PID_T
*)malloc((u_int
)(fds
* sizeof(PID_T
)))))
80 bzero((char *)pids
, fds
* sizeof(PID_T
));
85 /* break up string into pieces */
86 for (argc
= 0, cp
= program
; argc
< MAX_ARGS
; cp
= NULL
)
87 if (!(argv
[argc
++] = strtok(cp
, " \t\n")))
89 argv
[MAX_ARGS
] = NULL
;
94 for (gargc
= argc
= 1; argv
[argc
]; argc
++) {
95 if (!(pop
= glob(argv
[argc
]))) { /* globbing failed */
100 argv
[argc
] = (char *)pop
; /* save to free later */
101 while (*pop
&& gargc
< 1000)
102 gargv
[gargc
++] = *pop
++;
108 switch(pid
= vfork()) {
120 /* get new pgrp, void tty, etc.
125 /* Do not share our parent's stdin */
127 open(_PATH_DEVNULL
, O_RDWR
);
130 dup2(pdes
[1], 2); /* stderr, too! */
139 /* Hack: stdout gets revoked */
141 open(_PATH_DEVNULL
, O_RDWR
);
143 open(_PATH_DEVNULL
, O_RDWR
);
146 # if defined(LOGIN_CAP)
148 /* Set user's entire context, but skip the environment
149 * as cron provides a separate interface for this
151 usernm
= env_get("LOGNAME", e
->envp
);
152 if ((pwd
= getpwnam(usernm
)) == NULL
)
153 pwd
= getpwuid(e
->uid
);
156 pwd
->pw_gid
= e
->gid
;
157 if (e
->class != NULL
)
158 lc
= login_getclass(e
->class);
161 setusercontext(lc
, pwd
, e
->uid
,
162 LOGIN_SETALL
& ~(LOGIN_SETPATH
|LOGIN_SETENV
)) == 0)
165 /* fall back to the old method */
168 /* set our directory, uid and gid. Set gid first,
169 * since once we set uid, we've lost root privledges.
173 initgroups(usernm
, e
->gid
);
176 setuid(e
->uid
); /* we aren't root after this..*/
177 #if defined(LOGIN_CAP)
182 chdir(env_get("HOME", e
->envp
));
185 execvp(gargv
[0], gargv
);
187 execvp(argv
[0], argv
);
191 /* parent; assume fdopen can't fail... */
193 iop
= fdopen(pdes
[0], type
);
196 iop
= fdopen(pdes
[1], type
);
199 pids
[fileno(iop
)] = pid
;
203 for (argc
= 1; argv
[argc
] != NULL
; argc
++) {
204 /* blkfree((char **)argv[argc]); */
205 free((char *)argv
[argc
]);
212 cron_pclose(FILE *iop
)
220 * pclose returns -1 if stream is not associated with a
221 * `popened' command, or, if already `pclosed'.
223 if (pids
== 0 || pids
[fdes
= fileno(iop
)] == 0)
226 omask
= sigblock(sigmask(SIGINT
)|sigmask(SIGQUIT
)|sigmask(SIGHUP
));
227 while ((pid
= wait(&stat_loc
)) != pids
[fdes
] && pid
!= -1)
231 return (pid
== -1 ? -1 : WEXITSTATUS(stat_loc
));